Other options you can use the split test but I'm not too sure how effective, Hope someone can provide comments on this testing.
You really can earn good money in Adwords but you have to have good keywords, a carefully thought of bid price and of course, it could be a game of luck too!
Adwords is a big game. PPC marketing can be a real boon if you know how to use it perfectly. I prefer to read some ebooks and articles before i get into Adwords.